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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file sdl2_s.cpp Playing sound via SDL2. */
#ifdef WITH_SDL2
#include "../stdafx.h"
#include "../mixer.h"
#include "sdl_s.h"
#include <SDL.h>
#include "../safeguards.h"
/** Factory for the SDL sound driver. */
static FSoundDriver_SDL iFSoundDriver_SDL;
/**
* Callback that fills the sound buffer.
* @param userdata Ignored.
* @param stream The stream to put data into.
* @param len The length of the stream in bytes.
*/
static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
{
MxMixSamples(stream, len / 4);
}
const char *SoundDriver_SDL::Start(const char * const *parm)
{
SDL_AudioSpec spec;
SDL_AudioSpec spec_actual;
/* Only initialise SDL if the video driver hasn't done it already */
int ret_code = 0;
if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
ret_code = SDL_Init(SDL_INIT_AUDIO);
} else if (SDL_WasInit(SDL_INIT_AUDIO) == 0) {
ret_code = SDL_InitSubSystem(SDL_INIT_AUDIO);
}
if (ret_code == -1) return SDL_GetError();
spec.freq = GetDriverParamInt(parm, "hz", 44100);
spec.format = AUDIO_S16SYS;
spec.channels = 2;
spec.samples = GetDriverParamInt(parm, "samples", 1024);
spec.callback = fill_sound_buffer;
SDL_AudioDeviceID dev = SDL_OpenAudioDevice(nullptr, 0, &spec, &spec_actual, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
MxInitialize(spec_actual.freq);
SDL_PauseAudioDevice(dev, 0);
return nullptr;
}
void SoundDriver_SDL::Stop()
{
SDL_CloseAudio();
SDL_QuitSubSystem(SDL_INIT_AUDIO);
if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
SDL_Quit(); // If there's nothing left, quit SDL
}
}
#endif /* WITH_SDL2 */
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